What is 7x+9y=42,12x+10y=-4 ?

The solution to 7x+9y=42,12x+10y=-4 is x=-12,y=14

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

Popular >

7x+9y=42,12x+10y=-4

7 x + 9 y = 42, 12 x + 10 y = - 4

x = - 12, y = 14

Solution steps

[7 x + 9 y = 42 12 x + 10 y = - 4]

Isolate

x

for

7 x + 9 y = 42 : x = \frac{42 - 9 y}{7}

Substitute

x = \frac{42 - 9 y}{7}

[12 \cdot \frac{42 - 9 y}{7} + 10 y = - 4]

Simplify

[\frac{504 - 38 y}{7} = - 4]

Isolate

y

for

\frac{504 - 38 y}{7} = - 4 : y = 14

For

x = \frac{42 - 9 y}{7}

Substitute

y = 14

x = \frac{42 - 9 \cdot 14}{7}

\frac{42 - 9 \cdot 14}{7} = - 12

x = - 12

The solutions to the system of equations are:

x = - 12, y = 14

3 x - y = 2, 2 x - y = 3

x - 201 = 0, y - 202 = 0

2 x + 3 y = 19, 3 x + 2 y = 16

4 x - 3 y = 7, 5 x - 2 y = 14

6 x + 9 y = - 33, 5 x - y = 32