Solve.

{3x+y=42x+y=5

use the linear combination method.

a.) (-3,12)
b.) (-3,13)
c.) (0,4)
d.) (-1,7)

(D)(-1,7)

Step-by-step explanation:

We want to solve for x and y in the simultaneous equation

3x+y=4

2x+y=5

Subtract Equation 2 from Equation 1

x=-1

Substitute x=-1 into any of the equations to solve for x.

3x+y=4

3(-1)+y=4

-3+y=4

y=4+3=7

Therefore: (x,y)=(-1,7)

d (5 x (-20)) * (100 x (0.7))

step-by-step explanation:

5÷1/100 * -.7 *-20

copy dot flip

5*100 * -.7 *-20

rearrange

5*-20   * 100 *-.7

-100   *-70

7000

the answer is a

step-by-step explanation:

because if you put 1 in to the square root of x it equals 300.