Answer:
He bought 3 steaks and 4 watermelons
Step-by-step explanation:
Let
x -----> the number of steaks bought
y ----> the number of watermelons bought
we know that
[tex]x+y=7[/tex]
[tex]x=7-y[/tex] ----> equation A
[tex]3x+2.50y=19[/tex] ----> equation B
Solve the system of equations by substitution
Substitute equation A in equation B and solve for y
[tex]3(7-y)+2.50y=19[/tex]
[tex]21-3y+2.50y=19[/tex]
[tex]3y-2.50y=21-19[/tex]
[tex]0.50y=2[/tex]
[tex]y=4\ watermelons[/tex]
Find the value of x
[tex]x=7-4=3\ steaks[/tex]
therefore
He bought 3 steaks and 4 watermelons
